The Low Land of the Sahara and its relations to the Atlas range, according to the latest reports of Daumas, Carette, and Renou. The barometric measurements of Fournel render it very probable, that part of the north African desert lies below the level of the sea. Oasis of Biscara. Abundance of rock-salt in regions which extend from S.W. to N.E. Causes of nocturnal cold in the desert, according to Melloni—pp. 88–92. Information respecting the River Wadi Dra (one-sixth longer than the Rhine), which is dry during a great part of the year. Some account of the territory of the Sheikh Beirouk, who is independent of the Emperor of Morocco, according to manuscript communications of Capt. Count Bouet Villaumez, of the French Marine. The mountains north of Cape Nun (an Edrisian name, in which by a play of words a negation has been assumed since the 15th century) attain an altitude of 9186 feet—pp. 92–94. Gramineous vegetation of the American Llanos between the tropics, compared with the herbaceous vegetation of the Steppes in Northern Asia. In these, especially in the most fertile of them, a pleasing effect is afforded in spring by the small snow-white and red flowering Rosaceæ, Amygdaleæ, the species of Astragalus, Crown-imperial, Cypripedias, and Tulips. Contrast with the desert of the salt-steppes full of Chenopodiæ, and of species of Salsola and Atriplex. Numerical considerations with respect to the predominant families. The plains which skirt the Frozen Ocean (north of what Admiral Wrangel has described as the boundary of Coniferæ and Amentaceæ), are the domain of cryptogamic plants. Physiognomy of the Tundra on an ever-frozen soil, covered with a thick coating of Sphagnum and other foliaceous mosses, or with the snow-white Cenomyce and Stereocaulon paschale—pp. 94–96. Chief causes of the very unequal distribution of heat in the European and American continents. Direction and inflection of the isothermal lines (equal mean-heat of the year, in winter and summer)—pp. 96–105. Is there reason to believe that America emerged later from the chaotic covering of waters?—pp. 105–107. Thermal comparison between the northern and southern hemispheres in high latitudes—pp. 107–109. Apparent connexion between the sand-seas of Africa, Persia, Kerman, Beloochistan, and Central Asia. On the western portion of the Atlas, and the connection of purely mythical ideas, with geographical legends. Indefinite allusions to fiery eruptions. Triton Lake. Crater forms, south of Hanno’s “Bay of the Gorilla Apes.” Singular description of the Hollow Atlas, from the Dialexes of Maximus Tyrius—pp. 110–11.